✅ add test for non-comma generator handling with comma_compact_nulls option

Author: techouse

tests/unit/encode_test.py

@@ -1906,3 +1906,28 @@ def test_comma_compact_nulls_preserves_round_trip_marker(self) -> None:
             comma_compact_nulls=True,
         )
         assert encode({"a": [None, "foo"]}, options) == "a[]=foo"
+
+    def test_comma_round_trip_branch_for_non_comma_generator(self) -> None:
+        tokens = _encode(
+            value=[1],
+            is_undefined=False,
+            side_channel=WeakKeyDictionary(),
+            prefix="root",
+            comma_round_trip=True,
+            comma_compact_nulls=False,
+            encoder=EncodeUtils.encode,
+            serialize_date=EncodeUtils.serialize_date,
+            sort=None,
+            filter=None,
+            formatter=Format.RFC3986.formatter,
+            format=Format.RFC3986,
+            generate_array_prefix=ListFormat.INDICES.generator,
+            allow_empty_lists=False,
+            strict_null_handling=False,
+            skip_nulls=False,
+            encode_dot_in_keys=False,
+            allow_dots=False,
+            encode_values_only=False,
+            charset=Charset.UTF8,
+        )
+        assert tokens == ["root%5B%5D%5B0%5D=1"]